#include<iostream>
using namespace std;
int main(){
	int i,a,b,c,d;
	cin>>i;
	a=i/1000;
	b=i/100%10;
	c=i/10%10;
	d=i%10;
	cout<<d*1000+c*100+b*10+a;
}
/**************************************************************
	Problem: 1029
	User: admin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/